import enum
import uuid
from datetime import date, datetime, timezone
from sqlalchemy import Boolean, Date, DateTime, Enum, Float, ForeignKey, Integer, String, Text
from sqlalchemy.orm import Mapped, mapped_column, relationship
from .db import Base


def now() -> datetime:
    return datetime.now(timezone.utc)


class EntryKind(str, enum.Enum):
    weight = "weight"
    glucose = "glucose"
    water = "water"
    activity = "activity"
    sleep = "sleep"
    mood = "mood"
    meal = "meal"


class User(Base):
    __tablename__ = "users"
    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=lambda: str(uuid.uuid4()))
    email: Mapped[str] = mapped_column(String(320), unique=True, index=True)
    password_hash: Mapped[str] = mapped_column(String(255))
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=now)
    profile: Mapped["Profile | None"] = relationship(back_populates="user", cascade="all, delete-orphan")
    entries: Mapped[list["Entry"]] = relationship(back_populates="user", cascade="all, delete-orphan")


class Profile(Base):
    __tablename__ = "profiles"
    user_id: Mapped[str] = mapped_column(ForeignKey("users.id", ondelete="CASCADE"), primary_key=True)
    display_name: Mapped[str | None] = mapped_column(String(80))
    birth_date: Mapped[date | None] = mapped_column(Date)
    height_cm: Mapped[float | None] = mapped_column(Float)
    objective: Mapped[str | None] = mapped_column(String(120))
    health_context: Mapped[str | None] = mapped_column(Text)
    consent_health_data: Mapped[bool] = mapped_column(Boolean, default=False)
    updated_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=now, onupdate=now)
    user: Mapped[User] = relationship(back_populates="profile")


class Entry(Base):
    __tablename__ = "entries"
    id: Mapped[str] = mapped_column(String(36), primary_key=True, default=lambda: str(uuid.uuid4()))
    user_id: Mapped[str] = mapped_column(ForeignKey("users.id", ondelete="CASCADE"), index=True)
    kind: Mapped[EntryKind] = mapped_column(Enum(EntryKind))
    value: Mapped[float] = mapped_column(Float)
    unit: Mapped[str] = mapped_column(String(24))
    note: Mapped[str | None] = mapped_column(String(500))
    recorded_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=now, index=True)
    created_at: Mapped[datetime] = mapped_column(DateTime(timezone=True), default=now)
    user: Mapped[User] = relationship(back_populates="entries")